Sealing structure for cover made of resin

A sealing structure for a cover made of resin, the sealing structure comprising:

• the cover made of resin, which has a through-hole into which a shaft part is to be inserted;
• and
• a sealing apparatus to seal between the through-hole of the cover and the shaft part,
• wherein the sealing apparatus includes a support ring that is made of resin and has an annular shape about an axis, and an elastic body part that is made of an elastic material, has an annular shape about the axis, and is attached to the support ring,
• in a direction of the axis, an inner side is a direction toward an inside of the cover and an outer side is a direction away from the inside of the cover,
• the elastic body part has an annular seal lip that contacts the shaft part such that the shaft part is able to slide, and
• the support ring has an insert part which is an annular part that is to be inserted into the through hole, an outer side part which is an annular part that protrudes to the outer side from the through-hole and toward the outer side beyond the insert part, and a bonding part which is formed at the outer side part and has a surface that is annular about the axis and faces to the inner side,
• wherein the insert part extends along the axis and has an outer circumferential surface facing an outer periphery side,
• wherein the outer circumferential surface is spaced apart from an inner circumferential surface of the cover and terminates at an end portion having a diameter that is equal to a diameter of the inner circumferential surface of the cover, and
• wherein the boding part is bonded by welding to the cover.